I wanted to start an ubuntu virtual machine as follows in Knoppix 7.2.0DVD (booted with 'fromhd'):
root# qemu-system-x86_64 -cdrom ubuntu-12.04.3-dvd-amd64.iso
The iso image was read OK, with the ubuntu boot screen appearing in the vga display of the emulator. However the booting failed with the following message:
[ 29.044201] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
[ 53.044186] BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1]
[ 89.044214] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
When the iso image is burned to a DVD, the ubuntu system boots up without a problem from the disk. And "qemu-system-x86_64" starts a Knoppix VM from iso without problems. So it appears that the ubuntu iso and the qemu behaves as expected individually.
Although this problem may reside well outside the domain of Knoppix per se, I hope I may receive advice on where to go from here. Thanks in advance for any help.
Vintage 5362 IBM System/36 Mini-Computer Mainframe 5291 2, CRT Terminal DM12N501
$219.99
Digital DEC LK201 Terminal Keyboard RJ11 Connection Mainframe
$49.00
VINTAGE IBM Type 4869 External 5 1/4" ~ Floppy Disk Drive Mainframe ~
$129.99
$125.00
GMK Awaken - Mainframe base kit (BNIB - Factory Sealed)
$100.00
vintage lot of 3 computer tapes mainframe data ibm magnetic reels
$25.00
HP HEWLETT PACKARD 9826 Vintage Computer
$524.00
Very Rare Vendex Headstart II Computer + Keyboard Mouse CRT Monitor Powers On
$209.99
Vintage 1985 IBM 5291 2 X2790 8520850 System/36 Mini-Computer Terminal Base
$79.99
HP Compaq AlphaServer DS20e CPU 54-30060-01 KN311 667Mhz 5030059-01 54-30060-04
$599.00